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10 13 10 14 10 15 10 16 10 17 10 18 10 19 10 20 10 21 10 22 10 23 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966

= Free Coordinate    = Occupied(Single Region)     = Occupied (Var Region)     = Center of the grid